Hi, I am new to matlab and i want to generate a voltage sag signal using m-file using the following equation

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Appy18 2014-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/162493-hi-i-am-new-to-matlab-and-i-want-to-generate-a-voltage-sag-signal-using-m-file-using-the-following

评论： Appy18 2014-11-15

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x(t)=A(1−a(u(t−t1)−u(t−t2)));

where

0.1 ≤ a ≤ 0.9(depth of voltage sag)  
T ≤ t2 − t1 ≤ 8T(T is the period)
t1 <t2(moment of the sag starting and ending)
u(t)=1 for all t≥0(unit stp function)

I just tried the following command but i didn't get it. It showed error

t=0:0.0001:2;
f=2;
A=1.0;
W=2*pi*f;
x=A*sin(W.*t);
u=inline('t>=0');
a=0.6; t1=12; t2=24;
x1= (1-a(u(t-t1)-u(t-t2))).*x;
subplot(3,1,1)
plot(t,x1)
title('Voltage sag');
xlabel('time--->');
ylabel('Amplitude--->');

so pls. help me.

Thank you in advance

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回答（1 个）

MA 2014-11-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/162493-hi-i-am-new-to-matlab-and-i-want-to-generate-a-voltage-sag-signal-using-m-file-using-the-following#answer_158760

在 MATLAB Online 中打开

t=0:0.0001:2;
f=2;
A=1.0;
W=2*pi*f;
x=A*sin(W.*t);
u=inline('t>=0');
a=0.6; t1=12; t2=24;
x1= (1-a*(u(t-t1)-u(t-t2))).*x;
plot(t,x1)
title('Voltage sag');
xlabel('time--->');
ylabel('Amplitude--->');